Traffic light

This Arduino traffic light project was created by me on a day off, purely for fun and entertainment.

Traffic light logic

🟢 after the green light flashes, the 🟡 yellow light on, further 🔴 red lights up, red goes out, 🟡 yellow light up, 🟢 green again.

Signal	Before signal	Time seconds	Note
🟢		7
🟢	🟡	1	blink x 3
🟡	🔴	2
🔴	🟡	10
🟡	🟢	1

+---------+   +---------+   +---------+ 
|  start  |-->| R, Y, G |-->| |setup| |
+---------+   +---------+   +---------+    
                                |
                                |<--------+
                                V         |
                            *------*      |
                            | true |      |
                            *------*      ^
                                |         |
                                V         |
                            +---------+   |
                            | R.on    |   |
                            | R.light |   |
                            | R.off   |   |
                            | Y.on    |   ^
                            | Y.light |   |
                            | Y.off   |   |
                            | G.on    |   |
                            | G.light |   |
                            | G.blink |   |
                            | G.off   |   |
                            | Y.on    |   |
                            | Y.light |   |
                            | Y.off   |   |
                            +---------+   |
                                |         ^
                                V         |
                                +-------->+

Materials

Component	Quantity	Note
Arduino Uno	1
Red LED	1
Yellow LED	1
Green LED	1
Resistor	3	150Ω

Prototyping

Mounting

Demo